package com.baidu.Chapter01;

import java.util.Scanner;

public class ex1_9 {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        double mj,k,g;
        k = sc.nextDouble();
        g = sc.nextDouble();
        mj = k*g;
        System.out.println("面积："+mj);
    }
}
